Sigma DP2 Merrill review
Although images are sharp, it can take time for the DP2 Merrill to focus. The camera offers one selectable central AF point only, which even in good light requires a quick ‘hunt' before it locks onto the point of focus. In low-contrast light, the speed is slowed down further and the camera often does not achieve successful focus at all.
The camera's saving grace is its manual focus functionality, controlled using the focus ring on the lens. It overrides autofocus in the AF/MF option, and in the MF setting a focus distance indicator appears on screen. With the shutter button half-pressed, focus magnification is activated once the focus ring is adjusted. So, for static and slow-moving subjects, manual focus is best.